package com.summer.wxapp.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import java.security.spec.InvalidParameterSpecException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.primefaces.util.Base64;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.summer.core.annotations.Logger;
import com.summer.core.util.FacesUtil;

public class WechatAppUtil {

	@Logger
	static Log log;

	public static void responseMsg(String msg) {
		HttpServletResponse response = FacesUtil.getHttpServletResponse();
		response.setCharacterEncoding("UTF8");
		response.setHeader("content-type", "text/html;charset=UTF-8");
		try {
			response.getWriter().write(msg);
			System.out.println(msg);
			// log.info(msg);
			FacesUtil.getCurrentInstance().responseComplete();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}

	public static JSONObject getSessionKeyOropenid(String code) {
		// 微信端登录code值
		String wxCode = code;
		// ResourceBundle resource = ResourceBundle.getBundle("weixin");
		// //读取属性文件
		Map<String, String> requestUrlParam = new HashMap<String, String>();

		requestUrlParam.put("appid", WechatAppConstants.Config.appId); // 开发者设置中的appId
		requestUrlParam.put("secret", WechatAppConstants.Config.appSecret); // 开发者设置中的appSecret
		requestUrlParam.put("js_code", wxCode); // 小程序调用wx.login返回的code
		requestUrlParam.put("grant_type", "authorization_code"); // 默认参数

		// 发送post请求读取调用微信 https://api.weixin.qq.com/sns/jscode2session
		// 接口获取openid用户唯一标识
		JSONObject jsonObject = JSON.parseObject(UrlUtils.sendPost(
				WechatAppConstants.Config.url, requestUrlParam));
		return jsonObject;
	}

	public static JSONObject getUserInfo(String encryptedData,
			String sessionKey, String iv) {
		// 被加密的数据
		byte[] dataByte = Base64.decode(encryptedData);
		// 加密秘钥
		byte[] keyByte = Base64.decode(sessionKey);
		// 偏移量
		byte[] ivByte = Base64.decode(iv);
		try {
			// 如果密钥不足16位，那么就补足. 这个if 中的内容很重要
			int base = 16;
			if (keyByte.length % base != 0) {
				int groups = keyByte.length / base
						+ (keyByte.length % base != 0 ? 1 : 0);
				byte[] temp = new byte[groups * base];
				Arrays.fill(temp, (byte) 0);
				System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
				keyByte = temp;
			}
			// 初始化
			Security.addProvider(new BouncyCastleProvider());
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
			SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
			AlgorithmParameters parameters = AlgorithmParameters
					.getInstance("AES");
			parameters.init(new IvParameterSpec(ivByte));
			cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
			byte[] resultByte = cipher.doFinal(dataByte);
			if (null != resultByte && resultByte.length > 0) {
				String result = new String(resultByte, "UTF-8");
				return JSON.parseObject(result);
			}
		} catch (NoSuchAlgorithmException e) {
			log.error(e.getMessage(), e);
		} catch (NoSuchPaddingException e) {
			log.error(e.getMessage(), e);
		} catch (InvalidParameterSpecException e) {
			log.error(e.getMessage(), e);
		} catch (IllegalBlockSizeException e) {
			log.error(e.getMessage(), e);
		} catch (BadPaddingException e) {
			log.error(e.getMessage(), e);
		} catch (UnsupportedEncodingException e) {
			log.error(e.getMessage(), e);
		} catch (InvalidKeyException e) {
			log.error(e.getMessage(), e);
		} catch (InvalidAlgorithmParameterException e) {
			log.error(e.getMessage(), e);
		} catch (NoSuchProviderException e) {
			log.error(e.getMessage(), e);
		}
		return null;
	}
}
